Re:Some Insights from a Julia Developer
by vvanders on Sunday October 15, 2017 @12:22PM
(#15477799)
It's not an issue of allocation, it's an issue of allocation location to get better cache locality.
Take the JVM, a good majority of ORM databases uses Sun.misc.unsafe to do manual native memory allocation. Not because it's faster(because it isn't faster than bumping the nursery pointer).
They do it so they can control where disparate datatypes live in memory so that as a cache line is read in the prefetcher is already pulling in the next cache line.
Things like this will get you a 10-50x performance increase, which in some cases you absolutely need it.
Take the JVM, a good majority of ORM databases uses Sun.misc.unsafe to do manual native memory allocation. Not because it's faster(because it isn't faster than bumping the nursery pointer).
They do it so they can control where disparate datatypes live in memory so that as a cache line is read in the prefetcher is already pulling in the next cache line.
Things like this will get you a 10-50x performance increase, which in some cases you absolutely need it.